<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
    </head>
    <body>

        <form action="cgi/cal_cgi" method="GET">
            输入x:<input type="text" name="value_x">
            <br>
            <br>
            <br>
            输入y:  <input type="text" name="value_y">
            <br><br>
            <input type="submit" value="计算">
        </form> 

    </body>
</html>
